Seal structure for fuel battery

Abstract

In a fuel battery seal structure, a gasket has a base portion fitted in a non-bonded manner to a seal installation groove of a separator, and a seal protrusion brought into close contact with a seal groove of a separator. Presser projections and clearance grooves are formed in both sides in a width direction of the seal groove. The presser projections are brought into contact with the base portion of the gasket, and the clearance grooves are positioned in an opposite side to the seal groove as seen from the presser projections. Sum of widths of the seal groove and the presser projections in both sides thereof is smaller than a width of the seal installation groove, and sum of widths of the seal groove, and the presser projections and the clearance grooves in both sides thereof is larger than the width of the seal installation groove.

What is claimed is: 
     
       1. A seal structure for a fuel battery structured such that a gasket made of a rubber-like elastic material is installed to a seal installation groove formed in one separator among separators which are laminated with each other and face to each other in a thickness direction, and the gasket has a base portion which is fitted in a non-bonded manner to said seal installation groove, and a seal protrusion which is formed in a raised manner in the base portion and is brought into close contact with a seal groove formed in the other separator,
 wherein presser projections and clearance grooves are formed in both sides in a width direction of said seal groove, the presser projections being brought into contact with the base portion of said gasket, and the clearance grooves being positioned in an opposite side to said seal groove as seen from the presser projections, sum of widths of said seal groove and the presser projections in both sides of the seal groove is smaller than a width of said seal installation groove, and sum of widths of said seal groove, and the presser projections and the clearance grooves in both sides of the seal groove is larger than the width of said seal installation groove. 
 
     
     
       2. The seal structure for the fuel battery according to  claim 1 , wherein the presser projection has an interference in relation to the base portion of the gasket. 
     
     
       3. The seal structure for the fuel battery according to  claim 1 , wherein a groove depth of the clearance groove is smaller than a thickness of the base portion. 
     
     
       4. The seal structure for the fuel battery according to  claim 2 , wherein a groove depth of the clearance groove is smaller than a thickness of the base portion.